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白喉、破傷風、百日咳 (三合一補追疫苗)
Diphtheria, Tetanus and Pertussis 

白喉仍是全球多處地區的嚴重疾病。尤以近期在前屬蘇聯各新獨立國家出現的白喉疫症為甚。大部分受感染的例子出現於未曾或未完全接受預防接種的人士。

破傷風是一個全球性健康的問題。疾病通常發生於一些未曾接受過破傷風疫苗、或預防注射不足的人士。在發展中的國家，大部分的個案發生在嬰兒和幼童的身上。

白喉防疫注射一般是通過三合一補追疫苗 (DTP)。兒童必須在出生後 2、4 及 6 個月接受基本的預防注射。然後在 18 個月，6 歲及 12 歲接受加強劑。若兒在 7 歲以上，可給予已減量的白喉疫苗。

到有風險地區旅遊的人士，可進行基本接種程序或接受加強劑。需要經常到此等地區旅遊的人士，可每隔 10年接受加強劑。

Diphtheria remains a serious disease throughout much of the world. In particular, large outbreaks of Diphtheria are currently occurring throughout the New Independent States of the former Soviet Union. Most cases occur in non-immunised or inadequately immunized persons.

Tetanus is a global health problem. The disease occurs almost exclusively in persons who are non- immunised or inadequately immunised. In developing countries, most of the reported cases occur in infants and young children.

Diphtheria immunisation is administered by injecting Diphtheria toxoid, usually in conjunction with Tetanus and Pertussis vaccines (DTP, Td). For primary vaccination, children should receive the vaccine at 2, 4 and 6 months of age. Booster doses for diphtheria are also given at 18 months, 6 years and 12 years.

For persons beyond 7 years old, Diphtheria should be given in reduced concentration.
Primary or booster doses are recommended for travellers to areas with risk. For those who are frequently travelling to such areas, a ten-yearly booster dose is recommended.